JP5281506B2 - Crawler tension ring support member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crawler tension wheel support member in which a tension frame is difficult to be enlarged when preventing a squared tubular insertion part from being damaged. <P>SOLUTION: The crawler tension wheel support member includes: a support shaft 32 for supporting the crawler tension wheel; and the tension frame 34 having the squared tubular insertion part 33 internally engaged with a squared tubular guide rail 29 of a track frame 12 so as to slide. The insertion part 33 is formed by casting, and mechanically processed on an outer shape along an inner surface of the guide rail 29. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention includes a support shaft that rotatably supports a crawler tension ring, and a tension frame having a rectangular tube-shaped insertion portion that is slidably fitted into a rectangular tube-shaped guide rail portion of the track frame. The present invention relates to a crawler tension ring support member.

The conventional crawler tension ring support member can be slidably fitted into a rectangular tube-shaped guide rail portion formed of a commercially available square pipe with a rectangular tube-shaped insertion portion formed of a commercially available square pipe. (For example, refer to Patent Document 1).
As shown in FIG. 13A, the commercially available square pipe P is formed with curved surfaces on both the inside and the outside of the corner portion 48, and the outer curvature radius r1 of the outer curved surface and the inner curvature radius r2 of the inner curved surface are The radius is in accordance with the thickness t, and the outer radius of curvature r1 is larger than the inner radius of curvature r2.
For this reason, as shown in FIG. 13B, even if the insertion portion 33 is configured with a commercially available square pipe P having an outer diameter as close as possible to the inner diameter of the guide rail portion 29 configured with the commercially available square pipe P, the insertion is performed. The range in which each of the outer plane portions 47 of the insertion portion 33 can contact the inner plane portion 49 of the guide rail portion 29 in a state where the portion 33 is inserted into the guide rail portion 29 constitutes the insertion portion 33. It is determined by the size of the outer radius of curvature r1 at the corner portion 48 of the square pipe P (the smaller the outer radius of curvature r1, the smaller the radius).
In FIG. 13B, the difference between the inner peripheral surface dimension of the guide rail portion 29 and the outer peripheral surface dimension of the insertion portion 33 is exaggerated from the actual one.

JP 2005-178551 A

When an external force acts on the crawler tension ring supported by the support shaft via the crawler belt and the tension frame is twisted, a torsional moment is generated at the insertion portion with the guide rail portion as a reaction force receiver.
As shown in FIG. 13B, when a torsional moment M around the insertion portion center 46 is generated in the insertion portion 33, a reaction force F acts on the insertion portion 33 at a position near the end in the width direction of the outer flat portion 47. doing.
If the magnitude of the torsional moment M is constant, the reaction force F increases as the moment lever length L from the insertion portion center 46 decreases, and the insertion portion 33 is easily damaged.
Since the conventional crawler tension ring support member comprises the insertion portion 33 with a commercially available square pipe P, the moment lever length L is increased to act on the insertion portion 33 so as to prevent damage to the insertion portion 33. In order to reduce the reaction force F, it is necessary to select the square pipe P having a large outer diameter from the commercially available square pipes P to form the insertion portion 33, and accordingly, the tension frame is enlarged. Sometimes.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a crawler tension ring support member in which a tension frame is difficult to be enlarged in order to prevent damage to a rectangular tube-shaped insertion portion. .

A first characteristic configuration of the present invention is a tension having a support shaft that rotatably supports a crawler tension ring, and a rectangular tube-like insertion portion that is slidably fitted into a rectangular tube-shaped guide rail portion of a track frame. The guide rail portion includes a frame and a screw shaft insertion hole into which a screw shaft with an adjustable insertion depth of the insertion portion can be screwed , and the insertion portion and the support shaft are formed of an integral casting. The screw shaft insertion portion provided with the screw shaft insertion hole is provided integrally with the tension frame, and the female screw member formed with the screw shaft insertion hole is formed as the screw. The shaft insertion portion is configured separately from the shaft insertion portion and is detachably attached to the screw shaft insertion portion .

With the crawler tension ring support member of this configuration, as illustrated in FIG. 12, when the torsional moment M around the insertion portion center 46 is generated in the insertion portion 33 using the guide rail portion 29 as a reaction force receiver, the insertion portion In order to increase the moment lever length L from the center 46 and reduce the reaction force F acting on the insertion portion 33, that is, to increase the width B of the outer plane portion 47 of the insertion portion 33. A tension frame having a rectangular tube-shaped insertion portion 33 with a small outer radius of curvature r1 in the corner portion 48 can be provided.
Therefore, it is difficult to increase the size of the tension frame in order to prevent damage to the rectangular tubular insertion portion.

According to a second characteristic configuration of the present invention, the female screw member includes an attachment plate portion for attachment to the screw shaft insertion portion, and the attachment plate portion straddles a corner portion of the insertion portion of the rectangular tube shape. It is in the point provided with the edge part formed so that it may contact | abut on the both sides | surfaces continuing to the said corner | angular part .

According to a third characteristic configuration of the present invention, the tension frame has the insertion portion so that a center line of the insertion portion intersects a center line of the support shaft, and the screw shaft insertion hole has the insertion portion. Are formed at symmetrical positions across a virtual plane including the center line of the support shaft and the center line of the support shaft .
According to a fourth characteristic configuration of the present invention, the tension frame has a screw portion for fixing the female screw member to the screw shaft insertion portion formed at a symmetrical position across the virtual plane. It is in.

A fifth characteristic configuration of the present invention is a tension having a support shaft that rotatably supports a crawler tension ring and a rectangular tube-like insertion portion that is slidably fitted in a rectangular tube-shaped guide rail portion of a track frame. The tension frame includes, on one end side, a screw shaft insertion portion formed with a pair of screw shaft insertion holes into which a screw shaft capable of adjusting the insertion depth of the insertion portion with respect to the guide rail portion is adjustable. And the support shaft is fixed to the screw shaft insertion portion, the tension frame has the insertion portion so that the center line of the insertion portion intersects the center line of the support shaft, and A pair of screw shaft insertion holes are formed at symmetrical positions across the virtual plane, with a virtual plane including a center line of the insertion portion and a center line of the support shaft interposed therebetween. It lies in the fact that.

With this configuration, a crawler tension ring is provided for each of the left and right crawler belts so that tension can be applied to each of the crawler belts mounted on the left and right sides of the vehicle body in a work vehicle or the like. In assembling the support member and the screw shaft that can adjust the insertion depth of the insertion portion with respect to the guide rail portion, the left and right crawler tension ring support members can be made common to reduce the manufacturing cost.
That is, as illustrated in FIGS. 10 and 11, the tension frame 34 is assembled in association with one crawler belt with one side sandwiching the virtual plane S facing upward, and the other side sandwiching the virtual plane S is disposed. By assembling correspondingly to the other crawler belt on the upper side, the common crawler tension ring support member 30 can be assembled symmetrically corresponding to each of the left and right crawler belts.
Further, as illustrated in FIGS. 10 and 11, a pair of screw shaft insertion holes 35 is formed in the screw shaft insertion portion 36 at symmetrical positions with the virtual plane S interposed therebetween, and is supported by the screw shaft insertion portion 36. Since the shaft 32 is fixed, the connection strength between the support shaft 32 and the tension frame 34 can be reinforced by the screw shaft insertion portion 36.
A sixth characteristic configuration of the present invention is that the support shaft is formed of a casting integrally formed with the insertion portion, and is machined so that the crawler tension ring can be rotatably supported.
If it is this structure, the support shaft manufactured without integrating a support shaft and an insertion part mutually by bolt connection etc. can be provided.
According to a seventh characteristic configuration of the present invention, the screw shaft insertion hole is a pair of a corner portion of the insertion portion that is closest to a position where the screw shaft insertion hole exists, and the corner portion. It exists in the point formed in the position which cross | intersects the diagonal which connects the corner | angular part in a corner position.

It is a side view of a work vehicle (combine). It is a side view which shows a crawler traveling apparatus. (A) is a side view which shows the crawler traveling device which lowered | hung the body frame, (b) is a side view which shows the crawler traveling device which raised the body frame. It is a top view of a crawler traveling device. It is a partial cross section figure which shows a front part rocking | fluctuation mechanism. It is a partial cross section figure which shows a rear part rocking | fluctuation mechanism. It is a side view of a crawler tension device. It is a top view of a crawler tension device. It is principal part sectional drawing of a crawler tension device. It is a disassembled perspective view of a crawler tension device. The crawler tension ring support member is shown, (a) is a plan view, (b) is a front view, (c) is a left side view, and (d) is a right side view. It is sectional drawing which shows the fitting part of a guide rail part and an insertion part. (A) is sectional drawing which shows a commercially available square pipe, (b) is sectional drawing which shows the fitting part of the conventional guide rail part and insertion part.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a side view showing a conventional combine harvester for harvesting grains such as rice and wheat as an example of a work vehicle according to the present invention.
The combine includes a traveling unit 2 having a pair of left and right crawler traveling devices 1, a driving unit 3 equipped with a driver's seat, a cutting unit 4 at the front of the unit where a feeder 4 a is connected, a threshing unit 5 at the rear of the unit, and a grain. A tank 5a and the like are provided.

2 and 3 are side views of the crawler traveling device 1, and FIG. 4 is a plan view of the crawler traveling device 1.
The crawler traveling device 1 includes a drive sprocket 6 on the front side of the fuselage, a crawler tension wheel 7 on the rear side of the fuselage, a plurality of grounding wheels 8 disposed therebetween, and an upper wheel that supports the crawler belt 9 from the inner peripheral side. Carrier roller 10 and crawler belt 9, and a guide 9 a for preventing the crawler belt 9 from coming off. The rubber crawler belt 9 is wound around the drive sprocket 6, the carrier roller 10, the crawler tension wheel 7, and the grounding roller 8. It is stretched.

The driving sprocket 6 and the carrier roller 10 are supported on the side of the body frame 11, and the crawler tensioning wheel 7 and the grounding roller 8 are supported on the track frame 12.
In the crawler belt 9, a core bar 13 having a pair of left and right core bar protrusions 13 a protruding toward the inner peripheral surface side is embedded at a constant pitch in the front-rear direction. The grounding wheel 8 is mounted so as to straddle the left and right core metal protrusions 13a from the left and right sides, and the crawler tension ring 7 and the carrier roller 10 are mounted so as to be engaged between the left and right core metal protrusions 13a. .
The drive sprocket 6 is engaged with a drive hole formed between the core bars 13 before and after the crawler belt 9.

The body frame 11 is configured in a deck shape that extends over substantially the entire width of the lower part of the traveling body 2, and supports the deck frame 14 on which the above-described threshing portion 5 and the like are mounted, the drive sprocket 6, and the carrier roller 10. A fixed frame 15 that is long in the longitudinal direction of the machine body is provided.

  The fixed frame 15 is fixed to the lower surface side of the deck frame 14, and a posture changing mechanism 16 that can change the posture of the track frame 12 with respect to the body frame 11 in the vertical direction is provided across the fixed frame 15 and the track frame 12. It is.

The posture change mechanism 16 is configured by providing a front swing mechanism 16 a on the front side of the machine body and a rear swing mechanism 16 b on the rear side of the machine body across the fixed frame 15 and the track frame 12.
As shown in FIGS. 5 and 6, the front swing mechanism 16a and the rear swing mechanism 16b are respectively provided with swing support shafts 17a supported on the fixed frame 15 in a lateral direction toward the outer side of the machine body. 17b, swinging arms 18a and 18b supported on the swinging support shafts 17a and 17b so as to be swingable up and down, and operation arms 19a and 19b. Each of the swinging support shafts 17a and 17b is a crawler belt. 9 is disposed at a position higher than the track frame 12 by entering the inner peripheral side.

Each of the swing support shafts 17a and 17b penetrates the fixed frame 15 and is supported by the fixed frame 15 so as to be rotatable around the axis Xa and Xb. The swinging arms 18a and 18b are integrally fixed to the projecting end side, and the operation arms 19a and 19b are integrally fixed to the projecting end side of the swinging support shafts 17a and 17b toward the body side.
Each of the swing arms 18a and 18b is configured such that the swing support shafts 17a and 17b are fitted into bosses 20a and 20b integrally provided on one end side of the swing arms 18a and 18b. It is integrally fixed to 17b.

The swinging end side of the swinging arm 18a in the front swinging mechanism 16a is connected to a connecting support part 21 that is integrally fixed to the upper surface side of the track frame 12 so as to be swingable up and down by a pin 21a.
The swing end side of the swing arm 18b in the rear swing mechanism 16b is connected to a swing link 22 that is swingably connected to the track frame 12 by a pin 22a so as to be swingable up and down by a pin 22b.

  The operation arms 19a, 19b of the front swing mechanism 16a and the rear swing mechanism 16b are connected by a connecting rod 23 to form a four-link, and the operation arm 19b of the rear swing mechanism 16b, the deck frame 14, and the like. Are connected by a hydraulic cylinder 24.

  Therefore, when the swing arms 18a and 18b are driven and swung upward by the contraction operation of the hydraulic cylinder 24, the track frame 12 moves upward so as to be close to the body frame 11 side, and FIG. As shown, the ground clearance of the fuselage frame 11 is lowered. FIG. 3A shows a state where the ground height of the body frame 11 is the lowest.

  On the contrary, when the swing arms 18a and 18b are driven to swing downward by the extension operation of the hydraulic cylinder 24, the track frame 12 moves downward so as to be separated from the body frame 11 side, and FIG. As shown in the figure, the ground clearance of the fuselage frame 11 increases. FIG. 3B shows a state where the ground height of the body frame 11 is the highest.

  Accordingly, by independently operating the hydraulic cylinders 24 provided in each of the posture changing mechanisms 16 in the left and right crawler traveling devices 1, the ground height on the left and right of the airframe frame 11 is changed and adjusted, and the airframe frame 11 even on an inclined ground. Can be held substantially horizontally.

As shown in FIGS. 2 and 3, as the posture of the track frame 12 with respect to the body frame 11 is changed by the operation of the posture changing mechanism 16, the swing support shaft 17b of the rear swing mechanism 16b is moved to the position shown in FIGS. As shown in FIG. 3 (a), a contact member 27 that can be contacted via a boss 20 b in which a swing support shaft 17 b is fitted is provided on the track frame 12. The minimum vertical distance (the lower limit position of the body frame 11 with respect to the ground) is regulated.
At the upper end of the contact member 27, a horizontal surface 27a for stably supporting the boss 20b is formed. A curved surface that is recessed downward in a U shape in a side view along the outer peripheral surface of the boss 20b or a contact surface that is recessed downward in a V shape in a side view is formed at the upper end of the contact member 27. May be.

  An extension portion 25 extending from the swing arm 18b to the lateral side of the machine body is connected to the swing support shaft 17b of the rear swing mechanism 16b, and the carrier roller 10 can be freely rotated in the extension portion 25. I support it.

As shown in FIG. 6, the swing support shaft 17b of the rear swing mechanism 16b is a pin in a state where a support shaft member 25 different from the swing support shaft 17b is fitted in the tip hole portion of the swing support shaft 17b. Connected to each other and extended to the outer side of the aircraft.
The carrier roller 10 is supported on a support shaft member (extended portion) 25 via a bearing 26 so as to be freely rotatable.

The support structure of the crawler tension ring 7 will be described.
As shown in FIGS. 1 to 4, the crawler tensioning wheel 7 is attached to a crawler tensioning device 28 provided on the rear end side of the truck frame 12 in the longitudinal direction of the machine body.

The track frame 12 includes a lower track frame 12a that supports each grounded roller 8, and an upper track frame 12b that is connected to the upper side of the lower track frame 12a.
The upper track frame 12b is made of a commercially available steel square pipe having a square cross section.

  As shown in FIGS. 7 to 9, the crawler tensioning device 28 includes a rectangular tube-shaped guide rail portion 29 constituted by a rear end portion in the longitudinal direction of the machine body of the upper track frame 12 b, the crawler tensioning wheel 7, A crawler tension ring support member 30 supported by the guide rail portion 29 and an adjustment screw shaft 31 for adjusting the tension applied to the crawler belt 9 by the crawler tension ring 7 are provided.

  As shown in FIGS. 10 and 11, the crawler tension ring support member 30 has a quadrangular cross-section that is slidably fitted in the support shaft 32 that rotatably supports the crawler tension ring 7 and the guide rail portion 29. And a tension frame 34 having a rectangular tube-shaped insertion portion 33.

The tension frame 34 has a screw shaft insertion portion 36 in which a pair of screw shaft insertion holes 35 into which the adjustment screw shaft 31 can be inserted is formed on one end side, and the support shaft 32 is attached to the screw shaft insertion portion 36. It is integrally cast.

  The adjustment screw shaft 31 adjusts the insertion depth of the insertion portion 33 of the tension frame 34 with respect to the guide rail portion 29, thereby changing the support position of the crawler tension ring 7 in the longitudinal direction of the machine body and applying tension to the crawler belt 9. Is to adjust.

One end side of the adjustment screw shaft 31 is supported by a screw support 37 provided on the upper track frame 12 b in a non-rotating state, and the other end side is a screw shaft screw corresponding to one screw shaft insertion hole 35 of the screw shaft insertion portion 36. It is screwed into a female screw member 38 having a joint hole 38a .
The female screw member 38 is screwed to the screw shaft insertion portion 36.
The female screw member 38 includes a cylindrical portion 38A in which a screw shaft screwing hole 38a is formed to be screwed to the adjustment screw shaft 31, and an attachment plate portion 38B for attachment to the screw shaft insertion portion 36. . A screw insertion hole 38b is formed in the mounting plate portion 38B at a position matching the screw portion 35a formed in the screw shaft insertion portion 36.
The screw shaft threading hole 38a is inserted into the screw shaft insertion portion 36 in a state where the screw 35b is inserted into the screw insertion hole 38b and screwed into the screw portion 35a, and the mounting plate portion 38B is attached to the screw shaft insertion portion 36. It is formed so as to be concentric with the hole 35. At this time, the screw shaft screwing hole 38a has a corner portion closest to the position where the screw shaft screwing hole 38a is present in the corner portion of the insertion portion 33 and a diagonal position with respect to the corner portion. It is formed at a position intersecting with a diagonal line L connecting a certain corner. With the female screw member 38 attached to the screw shaft insertion portion 36 as described above, the attachment plate portion 38B straddles the corner portions of the rectangular tube-like insertion portion 33 and abuts on both side surfaces connected to the corner portions. As described above, end portions 38c and 38c are formed.

  The screw support 37 includes a screw shaft hole 40 formed in a boss portion of the screw support 37 through which a hexagonal shaft-shaped operation unit 39 provided at the front end of the adjustment screw shaft 31 is rotatably operated. A stopper surface 42 that comes into contact with the flange 41 that is provided integrally with the adjustment screw shaft 31 is provided to receive and support the reaction force from the adjustment screw shaft 31 that accompanies tension on the crawler belt 9.

The operation portion 39 inserted through the screw shaft hole 40 is inserted through a rotation prevention hole 44 formed in a rectangular plate-shaped rotation prevention body 43.
The anti-rotation hole 44 is formed in a hexagonal shape with which the operation portion 39 is engaged, and the adjustment screw shaft 31 is prevented from rotating by the contact of the side portion of the anti-rotation body 43 with the screw support 37.
Further, a retaining pin 45 for retaining the rotation preventing body 43 is removably inserted into the operation portion 39.

Accordingly, the female screw member 38 moves with respect to the adjusting screw shaft 31 by removing the rotation stopper 43 from the operation portion 39 and rotating the operation portion 39, so that the crawler tension ring 7 is moved.
The tension applied to the crawler belt 9 can be adjusted by changing the support position in the longitudinal direction of the machine body.

  The entire crawler tension ring support member 30 is integrally formed of a casting such as ductile cast iron, and the square pipe-shaped (hollow) insertion portion 33 is machined into an outer surface shape along the inner surface of the guide rail portion 29. The support shaft 32 is machined into a circular cross section so as to support the crawler tension ring 7. A lid that closes the inside of the insertion portion 33 on the side of the support shaft 32 is integrally formed of a casting, and the end of the insertion portion 33 opposite to the support shaft 32 side is open. .

Accordingly, as shown in FIG. 12, when the torsional moment M around the insertion portion center 46 is generated in the insertion portion 33 using the guide rail portion 29 as a reaction force receiver, the moment lever length L from the insertion portion center 46 is increased. Thus, the outer radius of curvature r1 at the corner portion 48 is set to a desired value so that the reaction force F acting on the insertion portion 33 can be reduced, that is, the width B of the outer plane portion 47 of the insertion portion 33 is increased. A tension frame 34 having a rectangular tube-shaped insertion portion 33 formed in a radius of curvature can be provided.
In FIG. 12, the difference between the inner peripheral surface dimension of the guide rail portion 29 and the outer peripheral surface dimension of the insertion portion 33 is exaggerated from the actual one.

  As shown in FIGS. 10 and 11, the tension frame 34 has the insertion portion 33 so that the center line Y33 of the insertion portion 33 intersects the center line Y32 of the support shaft 32, and the center line of the insertion portion 33 A symmetric shape is formed across the virtual plane S including Y33 and the center line Y32 of the support shaft 32, and a pair of screw shaft insertion holes 35 are formed in symmetrical positions across the imaginary plane S.

  Therefore, the tension frame 34 is assembled corresponding to one crawler belt 9 with one side sandwiching the virtual plane S facing upward, and corresponding to the other crawler belt 9 with the other side sandwiching the virtual plane S facing upward. Thus, the common crawler tension ring support member 30 can be assembled symmetrically corresponding to each of the left and right crawler belts 9.

  That is, in FIGS. 7 to 10, the crawler tension ring support member 30 attached to the crawler tension device 28 on the left side of the machine body is shown, but the adjustment screw shaft 31 is inserted into the other screw shaft insertion hole 35 of the screw shaft insertion portion 36. As a result, it can be used as a crawler tension ring support member 30 attached to the crawler tension device 28 on the right side of the machine body.

[Other Embodiments]
1. The crawler tension ring support member according to the present invention may be manufactured separately for each of the left and right crawler traveling devices. That is, but it may also be those having a single screw shaft insertion hole.

INDUSTRIAL APPLICABILITY The present invention can be suitably implemented in a crawler traveling device for an agricultural work vehicle such as a combine or tractor or a construction work vehicle such as a backhoe.

7 Crawler tension ring 12 Track frame 29 Guide rail portion 31 Screw shaft 32 Support shaft 33 Insertion portion 34 Tension frame 35 Screw shaft insertion hole 36 Screw shaft insertion portion S Virtual plane Y33 Centerline Y32 of insertion portion Centerline of support shaft

Claims (7)

A support shaft for rotatably supporting the crawler tension ring, a tension frame having a rectangular tube-shaped insertion portion slidably fitted in a rectangular tube-shaped guide rail portion of the track frame, and an insertion depth of the insertion portion A screw shaft insertion hole through which a screw shaft with adjustable height can be inserted ,
The insertion portion and the support shaft are formed of an integral casting and machined into an outer shape along the inner surface of the guide rail portion ,
A screw shaft insertion portion provided with the screw shaft insertion hole is provided integrally with the tension frame,
A crawler tension ring support member in which the female screw member in which the screw shaft insertion hole is formed is formed separately from the screw shaft insertion portion and is detachably attached to the screw shaft insertion portion . The female screw member includes an attachment plate portion for attachment to the screw shaft insertion portion, and the attachment plate portion straddles both side surfaces connected to the corner portion across the corner portion of the rectangular tube-like insertion portion. The crawler tension ring support member according to claim 1, further comprising an edge portion formed so as to contact the crawler. The tension frame has the insertion portion such that a center line of the insertion portion intersects a center line of the support shaft, and the screw shaft insertion hole has a center line of the insertion portion and the center of the support shaft. The crawler tension ring support member according to claim 1, wherein the crawler tension ring support member is formed at a symmetrical position across a virtual plane including a line. 4. The crawler tension ring support member according to claim 3, wherein the tension frame has a threaded portion for fixing the female threaded member with respect to the threaded shaft insertion portion at a symmetric position across the virtual plane. . A support shaft that rotatably supports the crawler tension ring, and a tension frame having a rectangular tube-like insertion portion that is slidably fitted in a rectangular tube-shaped guide rail portion of the track frame,
The tension frame has at one end a screw shaft insertion portion formed with a pair of screw shaft insertion holes through which a screw shaft capable of adjusting the insertion depth of the insertion portion with respect to the guide rail portion is adjustable. The support shaft is fixed to the screw shaft insertion portion,
The tension frame includes the insertion portion such that a center line of the insertion portion intersects a center line of the support shaft, and includes a virtual plane including the center line of the insertion portion and the center line of the support shaft. Is formed in a symmetrical shape across the
A crawler tension ring support member in which the pair of screw shaft insertion holes are formed at symmetrical positions across the virtual plane. The crawler tension ring support member according to claim 5, wherein the support shaft is formed of a casting integrated with the insertion portion, and is machined so that the crawler tension ring can be rotatably supported. The screw shaft insertion hole connects a corner portion of the corner portion of the insertion portion closest to a position where the screw shaft insertion hole exists and a corner portion diagonal to the corner portion. The crawler tension ring support member according to any one of claims 1 to 6, wherein the crawler tension ring support member is formed at a position intersecting with a diagonal line.

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